Because you like Louis de Pointe du Lac in Interview with the Vampire: The Vampire Chronicles
Victor Frankenstein can create life, so he's pretty awesome if he says so himself. See them in Frankenstein.
Xander Harris' life motto: laugh in the face of danger and then hide until it goes away. See them in Buffy the Vampire Slayer.
Ofelia is face-to-face with the deadliest creatures of the underworld and completely unafraid. See them in Pan's Labryinth.
This barber doesn't cut hair. Sweeney Todd sends his clients down a chute to be baked into his partner-in-crime's pies. See them in Sweeney Todd: The Demon Barber of Fleet Street.
Christine Daae has been secretely taking lessons from a phantom musician. It sounded less creepy in her head. See them in The Phantom of the Opera.
Basil Hallward is dominated, soul, brain, and power by Dorian. See them in Dorian Gray.
Sometimes being a supportive girlfriend like Ophelia doesn't work out too well. See them in Hamlet.
Although Thomas Sharpe is an English baronet, he doesn't have a Shilling to his name. He's in America to sell his invention and marry rich. See them in Crimson Peak.
Green skin, pointy hat, evil cackle—this villain has it all! See them in The Wizard of Oz.
A reclusive introvert, Liz Sherman has a temper that's literally lethal. See them in Hellboy.
Drusilla's hobbies include dolls, music, and killing people. See them in Buffy the Vampire Slayer.